tools/profile: fix kernel delimiter when folding (iovisor#2758)

retain delimiter with folding enabled

tools/profile.py

@@ -296,8 +296,6 @@ def aksym(addr):
 has_enomem = False
 counts = b.get_table("counts")
 stack_traces = b.get_table("stack_traces")
-need_delimiter = args.delimited and not (args.kernel_stacks_only or
- args.user_stacks_only)
 for k, v in sorted(counts.items(), key=lambda counts: counts[1].value):
  # handle get_stackid errors
  if not args.user_stacks_only and stack_id_err(k.kernel_stack_id):
@@ -334,7 +332,7 @@ def aksym(addr):
  else:
  line.extend([b.sym(addr, k.pid) for addr in reversed(user_stack)])
  if not args.user_stacks_only:
- line.extend(b["-"] if (need_delimiter and k.kernel_stack_id >= 0 and k.user_stack_id >= 0) else [])
+ line.extend([b"-"] if (need_delimiter and k.kernel_stack_id >= 0 and k.user_stack_id >= 0) else [])
  if stack_id_err(k.kernel_stack_id):
  line.append(b"[Missed Kernel Stack]")
  else: